If it ran out of diesel then you pulled air into the lines, pump, injector lines. Getting all the air out is a real pita. You may need to open the injector lines at the injectors to bleed all the air out. Once you have the nuts on the injector loosened then you need to crank the engine over until you see fuel oozing out the lines then you need to tighten the nuts again and then try starting again with your foot on the throttle pedal to the floor, once it starts keep the revs up above 1500 to ensure that it stays running. Been there done that no fun at all. Unfortunately for you I don't believe the 603 6 cylinder engine has a manual primer pump as the 617 5 cylinder engine does. Good luck on this challenge.

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Gary
OBK #37